Setup
The Getting Started instructions require the use of Maven, so you'll need to download it. Using OAuth 2.0 is also covered in the tutorial, so you'll need to create an App Engine app to use for deploying your code.
Downloading Maven
Complete instructions for downloading Maven and installing Maven for App Engine are provided in the Using Apache Maven page.
Creating an App Engine app
To create an App Engine app:
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In your browser, make sure you are logged into the Google account you want to use for the project and visit cloud.google.com/console. You may need to accept one or more Terms of Service.
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Click Create Project.
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In the New Project dialog, assign some name for your project. It need not match the name you assign to your Maven project (described later). You can accept the project ID or enter your own value. The main thing to note about the project ID is that this is the App Engine app ID, which you need later. Click Create to create the project.
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Copy the project ID to use later.
Next...
At this point, you are ready to create a Maven Endpoints project.
Continue to Creating an Endpoints Backend Project.